STRAIN GRADIENT PLASTICITY - THEORY AND EXPERIMENT
STRAIN GRADIENT PLASTICITY - THEORY AND EXPERIMENT
复制标题
DOI：
10.1016/0956-7151(94)90502-9
复制
发表时间：
1994-02-01
期刊：
影响因子：
--
通讯作者：
HUTCHINSON, JW
中科院分区：
文献类型：
--
作者：
FLECK, NA;MULLER, GM;HUTCHINSON, JW
位错理论用于调用速率无关塑性的应变梯度理论。硬化被认为是由于随机存储和几何必要的位错的积累。几何上必要的位错密度与塑性应变梯度成比例。本文引入塑性变形理论，以唯象的方式描述应变硬化和应变梯度硬化的相对作用。该理论是Cosserat偶应力理论的非线性推广。细铜线的拉伸和扭转实验证实了应变梯度硬化的存在。这些实验是根据新理论解释的.
Dislocation theory is used to invoke a strain gradient theory of rate independent plasticity. Hardening is assumed to result from the accumulation of both randomly stored and geometrically necessary dislocations. The density of the geometrically necessary dislocations scales with the gradient of plastic strain. A deformation theory of plasticity is introduced to represent in a phenomenological manner the relative roles of strain hardening and strain gradient hardening. The theory is a nonlinear generalization of Cosserat couple stress theory. Tension and torsion experiments on thin copper wires confirm the presence of strain gradient hardening. The experiments are interpreted in the light of the new theory.